## Physics: Principles with Applications (7th Edition)

a. $20^{\circ} C$. b. $3500^{\circ} F$.
a. Use the formula on page 362. $$\frac{5}{9}(68^{\circ} F – 32) = 20^{\circ} C$$ b. Use the formula on page 362. $$\frac{9}{5}(1900^{\circ} C) + 32 = 3452 \approx 3500^{\circ} F$$